Center-drive lathe



Jan. 29,- 1929.

w. F. GROENE CENTER DRIVE LATHE a `INV TOR. my

A TT ORNE Y.

Jan. 29, 1929. 1,790,721 w. F. GROENE l CENTER DRIVE LATHE Filed Jan.18. 1928 5 Sheets-Sheet 2 -INV TOR.

A TTORNE Y.

Jan. 29, 1929.

1,700,721 w. F. GROENE CENTER DRIVE LATHE;

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w. F. GROENE Fiied Jan. 18, 1928 CENTER DRIVE LATHE h -S 4 l eetsg heetI ATTORNEY.

Jan. 29, 1929, 1,700,721

yv. F. GROENE CENTER DRIVE LATHE Filed Jan. 18, 1928 s sheets-sheet 5INV NTOR.

A TTORNE Y.

Patented J an. 1929.l

` UNITI-'1DV STAT-151sv PATENT OFFICE.

WILLIAM E. GROENE, OE CINCINNATI, OHIO, AssIGNon TO THE E.. x. LE BLONDNIA- CHINE TOOL COMPANY, OE CINCINNATI, OHIO, A CORPORATION OE DELAWARE.

CENTER-DRIVE IIA'IHE.

Application mea January is, 192s. serial No. 247,715.

My invention relates to the provision in lathes for a centrall vdrivenand centrally 1o- `cated chuckin device for engaging and rot tating thewor ,thus leaving a space between 5 the spindlesand the chucking deviceon each side of the work, where turning operations can be simultaneouslypracticed.

.More specifically my invention relates to crank shaft lathes forturning or forming the stub and flan e ends and pins of crank shaftssimultaneous y, and other operations of similar character, havingprovisions Jfor rigidly holding a crank shaft on agpreviously turnedbearing or bearings, and means for driving and also for locating a shaftendwise in the lathe.

It is my object to provide for a hollow, externally driven member,having jaws to engage the work, located intermediate the spindles of alathe to serve as the chucking element of a lathe, said member being ona fixed center at all times, and not movable except in a rotary manner.In order to permit the workman to-charge a piece of work into themachine he must then insert it endwise through thek hollow member, andto-provide for this operation, it is my object to use a crane device.

The crane device is movable in a iixed relation with the chuckingmember, and according to my invention the crane arm is such as to ,holdthe work -rigidly while charging and removing it, Aand to be free toswing suiiicient to clear the work after the charging operation iscomplete, and when moving intoposition to engage the work prior toremoval.

A s distinguished from center drive lathes of the p ast, in which thecenter drive chuck swings awayfrom working position while the work isbeing loaded and unloaded, which requires the manipulation of a splitbearing,

4the operation ofmy device is steadier and much stronger, as' well asbeing more rapidly and easily operated. I In thedevice illustrated inthe drawings I have shown and in the s ecicationI specifi-v 'callydescribe a selecte and preferred type of chucking member, crane, andoperating mechanism for the same, which is suitable to the particularstructure illustrated. It will be understood, however, that theinvention inherent in thestructures, and which is set forth in theappended claims, is not limited to the thereof, to engage .over

embodiment shown, but may take various forms dependent u on therequirements of the machine that are esired.

In the drawings y Figure 1 is a central longitudinal vertical bodying myinvention, with the crane in side elevation, and shown in two positions.

Figure 2 is a perspective view of a lathe showing the crane )inl removedposition.

Figure 3 is a detail elevation of the frame portions ofthe chuckingmember.

Figure 4 is a section on line A--A of Figure 3.

Figure 5 is an end elevation of the crane structure and the chuck.

Figure 6 is an end elevation of the chuck on a larger scale.

Figure 7 is a detail of the equalizer device Isection taken throughparts of a lathe emused in connection with the abutment element of thedrive.

Figure 8 is a detail illustratin the centering arrangement within thechuc Figures 9, 10 and 11 are details of a modified mounting of thecrane track.

Figure 12 is a detail of a crank shaft journal and chuck jaw. y

I have not shown an entire lathe since this is not required for afullexplanation of my invention. The centers 1 and 2 are shown as engaging acrank shaft 3, of which the stub and ange ends are to be formed.

I show two front and two rear facing slides at 4, 4, and 5, 5,respectively. A housing located centrally of the bed of the lathe lforhousing the chuck,- isshown/-as/having two parts 6 and 7, which arecomplementary and bolted together at 8 and 9.

The chuck body 10 is wider than the housing, and is formed as a cylinderwithribs 11, 11 extending inwardly at the outer edges the outside of thehousing. The housinghas a central channel 12, and the chuck body hasgear teeth at 13,

which are cleared by the'channel 12. At the l gear teeth on the chucbody.

` any particular type of jaw device.

. 27, 27 above the lugs provide for a It is .important to note, however,that the bushing parts 18a in the one` gripping jawis such as to fitaccurately over a selected bearing ofthe crank shaft, and when the shaftis lowered into position from the crane, if it is not accuratelycentered,`it will automaticall adjust itself to the bushing 18, Thebusliing 19a in the other work gripping jaw'is made smaller than thelength of the bearing of the crank shaft which it engages, thuspermitting this slight adjustment.

As will be described, the loading device can an internal invertedV-shaped lower edge',

and an external inverted V-shaped upper edge. This plate 42 ispermanently mounted, as shown in the drawings, but could be made with apivotal connection at 40a on one standard and a locking bolt connectionat 41a to the other standard as shown in Figs. 9, 10 and 11. p

A carriage is provided to move along the plate 42, said carriage beingformed of a .metal platel 43, having deep flanges 44 around its edges,and a pair of intermediate ribs A 45, over which intermediate ribs issecured a cover plate 46.

The rollers 47 and 48, to match the edges on the top and bottom of theplate, are mounted on pins 49 which lie in bosses formed at a crankshaft as accurately as possible-with relation to the chuck,at theinnerend of thel be adjusted to insert the shaft to an accurate cranemovement.

position. The fillets 18b at the sides of the journal on th( crank shaftwill engage both sides of the part 18a, which will give a very lineadjustment to the shaft. The other jaw part 19 will not interfere withthis action.

On the two jaw ribs 18, 18 of the chuck body pair of mounting'bolts. Theribs 28, 28 of the chuck body are connected together in the lowerforward portion of the chuck body with an integral block 29. (Figs. 4and 7.) The block forms an abutment for a contact bar 30, which hasholes 31, 31 in its ends, in which lie loosely the heads of the bolts32, 32, said bolts being located in the holes 27.

The contact bar thus lies on the vtwo lugs 26, and can shift withrelation thereto. It has a V-shaped underside, and the apex of theV-shaped underside or edge is the portion of the contact bar thatengages the block 29.

This contact bar engages a portion of the crank ,shaft which liesbetween the two jaws, in the space defined by the ribs 28, 28.

The opportunity of this contact bar to rock on its mounting will permitit to adjust itself to irregularities in the Shape of the shaft beingoperated upon. It is one of the improvements in our structure to providean equalizing driving lug in the center drive chuck.

Vlien changing the machine from one type of shaft toanother, a differentshaped contact 'bar can be used, and also the Abushings in the grippingjaws will be arranged to accomplish the function above described.

In order to move a crank shaft into'the chuck endwise, when the movablejaws are swung back to clear the lower jaws, I provide for a crane.

Standards 40, 41 support a plate 42, having The space between the twocentral ribs of the carriage provides a housing within which slides ablock 51, said block being secured to the piston rod 52 of a suitableair cylinder operating device 53.

y This air cylinder .or other power means (Fig. 4) are lugs 26, 26,`andthreaded lholes is mounted on the top of the carriage `and moves withit, and will have a flexible power connection. I

The block 51 has two arms which project downwar'dlythrough a space leftbetween the surrounofin ribs on the carriage plate, and terminate Jnbosses 54, 54, in which is mounted a pivot pin 55 for the crane arm.

The crane arm 56 is generallyv U-shaped so as to permit of its lower endbeing inserted into the chuck body. The lower end ofthe crane arm has ahollow receiving member 57, shaped to engage the central pin of thecrank shaft to be loaded into the machine.

The upper portion of the crane arm has a block 58 thereon, which isjournaled over the pivot pin 55. A heavy pin 59 is mounted in the upperportion of the block, above its pivot point, and projects at both thefront and back of the block and crane arm. An abutment 60, -located inthe underside of the carriage i in a boss projecting from the coverplate 46. strikes the forward end of this 'pin'. and a like screw 61 ina boss on the back of the carriage strikes the other end of the pin, atsuch times as the crane arm is drawn up by the air cylinder intoposition of establishingy the contact noted. .y

vThe crane arm thus cannot swing on its pivotal connection to thesliding block that is actuated by the air cylinder when the arm is drawnup into contact with the abutment screws, which point can be adjusted bymeans of the screws.

rio-

dotted rines at A in Eig. 1.

and centers for the lathe,

The operator then moves the carriage so as -to thrust the crank shaftthrough the chuck and bring the axial journals thereof which are to begripped in th'e jaws of the chuck into position over them. It 'will be.ust the adjustable stop.

convenient to ad] screw to stopthe crane arm at just the correctposition to bring the shaft into chucking relation to the jaws.

The position of the shaft at B, in Fig. 1, illustrates this second stageof charging.

The operator then actuates the air cvlinder to permit the crane arm todrop, which it does, so as to deposit the crank shaft in correctposition withln C, Fig.V 1).

the chuck (position' 'drive chuck,

3. In alathe, a chuck having a rotary hollow body through which the workprojects, work gripping means within the body, a driving element withinthe body having a compensating movement and arranged to abut the Work,and means for rotating the body, said work gripping means arranged toengage journals on the work and thedriving element constituting the soleelement that lestablishes driving relation between the chuck and thework 4. In a crank shaft lathe having a center a loading device thereforcomprising in combination with the bed of the lathe, a support havingfixed relation to the said bed, an) arm movable along the said sup port,in a direction for thrusting al crank shaft into the chuck, and means onthe arm for engaging a crank shaft, power means for actuating the arm,and means for holding the arm rigidly when in position for loading andunloading a shaft from the chuck, and pivotally when in position ofrelease of the -shaft when the latter is engaged by the chuck..

5. Iny a ci'ank shaft lathe -having aI cen- The afm 0f the Crane is 110Wfree t9 Swing, ter drive chuck, a loading device therefor eration isreversed, and it will be noted that when the crane arm has been elevatedby the air cylinder, position B again, that the rlgid relation-of thearm to the carriage will again be established, whereupon the crank shaftcan withdrawn from the lathe without danger of tipping, or striking anyof the tools, marring the shaft or injuring the operator.

Having thus described a typical mechanism illustrative of my invention,and noted its operation, what I claim as new and desire to secure byLetters Patent, is

1. In a lathe the combination with a bed, of a fixed housingintermediate the centers, a rotary chuck held by said housing, and meansfor driving said chuck,I and a loa-ding device associated with said bed,and comprising a work holding member movable so as to insert the workendwise through the chuck, said member having movement axially of thechuck and means for maintaining the said member rigid as the memberinserts the work in the chuck.

2. In a lathe, a chuck having a rotary hol'- low body through which thework projects, work grippingmeans within the body,vand meansfor abuttingagainst the work and driving the same comprising a bar` loosely mountedat its ends within the body, and having an abutment within the bodyagainst which it engages, said bar having a taper face which engagesagainst the abutment,

andholds the crank shaft, in

- on the carriage.

comprising 1n combination with the bed of the lathe, a support extending.in a direction lengthwise of the bed, and means for holding it in fixedrelation to the bed, a carriage arranged to travel on said support, amember movable vertically in said carriage, and a crank shaftsup-porting arm pivotally mounted on said vertically movable member,

together with abutment means for the arm on the carriage to hold the armrigid against pivoting, when said arm is in loading position.

6; In a crank shaft Alathe having a center drive chuck, a loading devicetherefor comprising in combination with the bed of the lathe, a supportVextending in a direction lengthwise of the bed, and means for holding itin fixed relation thereto, acarriage movable on said support, and acrank shaft. supporting arm having a projection on its' lower end onwhich a. crank shaft is supported in position to be thrust into-the,chuck,

said projection being'so shaped and located as'to enter thechuck withthe shaft thereon, and means for mounting said supporting arm 7. In acrank shaft lathe having a .center drive chuck, a loadingdevice'ther'efor comprising in combination. with the bed ofthe. lathe, asupport extending in a direction lengthwise of the bed` and means forholding it in fixed relation thereto, a carriage mov-s able on saidsupport, and a crank sha-ft sup.- porting arm having a projection on itslower end on which a crank shaft is supported in position to be thrustinto the chuck', said projection beingso shaped and located as to enterthe chuck with the shaft thereon into the chuck, and means for mountingsaid supporting arm on the carriage, and power means prising incombination with the bed of the lathe, a support extending in adirection lengthwise of the bed, and means for holding it in fixedrelation thereto, a carriage movable on said support, and a crank shaftsup-- porting arm having a projection on its lower end on,.which a crankshaft is supported so as to permit thrusting of the projection with theshaft thereon into the chuck, and means for mounting said support-ingarm on the car.- riage, said arm having a pivotal relation to thecarriage, and means at one position which fixes the arm againstpivoting.

9. In a crank shaft lathe, a loading device for inserting a crank shaftinto a chuck, comprising a member on which the shaftis held, means forguiding the path of said member to move it in a line to insert a shaftinto the chuck, and means for moving the member relative to thehorizontal plane of the lathe, said member being pivotal with relationto the lastnamed means and means for holding the member rigid when inone horizontal plane, for the purpose described.

10. In a crank shaft lathe, aloading device for inserting a crank shaftinto a chuck, comprising a member on which the shaft is held,l means forguiding the path of said member to move it 1n a line to insert a shaftinto the chuck, and means for moving the member relative to thehorizontal plane of the lathe, said member being pivotal with relationto the last named means and means for holding the member rigid when inone horizontal plane, for the purpose described, in combination with astop located with relation to the chuck for defining a position of themember when the crank shaft to be loaded is in position for engagementby the chuck.

11. In a center drive chuck, the combination wit-h means therein toengage over bearings on a crank shaft constituting the work at aplurality of points, the engaging means at one of said points arrangedto accurately fit 'a bearing on the crank shaftso as to center the same,and the engaging means at another of said points arranged to permit someendwise movement of the engaged portion of the crank shaft. j

12. In a center drive chuck, the combination with crank shaft bearinggripping jaws located at two points within the chuck, bushings in thejaws, the bushing in one of the jaws of a slze and shape to center thebearmg engaged by it lengthwise and axially of the chuck, and thebushing in the other of' said jaws of a size to permit some endwisemovement of the crank shaft bearing engaged by it. 13. In a lathe thecombination of a center drive chuck into which a crank shaft must beinserted endwise, means within )the chuck arranged to center the crankshaft automatically in its axial position with relation to the chuck,and a loading device movable axially of the chuck for inserting a crankshaft into the same, said loading -device having a stop whereby theshaft Will be delivered in approximate position for engagement by theautomatic centering means. l

14. In a crank shaft lathe, having a center drive chuck, means withinthe chuck for engaging a bearing on the crank shaft,'said means arrangedto fit a'previously turned bearing on the crank vshaftae'curately, and acharging device for inserting crank shafts into the lathe, said chargingdevice having a movement limiting means and arranged. to deliver a crankshaft to the chuck in a .position with the said bearing in position forengagement by the said means within the chuck.

15. In a crank shaft lathe, having a center drive chuck, means withinthe chuck for engaging a bearing on the crank shaft, said means arrangedto fit a previously turned bearing on the crank shaft accurately, and acharging device for inserting crank shafts into the lathe, said chargingdevice having a movement limiting means and arranged to deliver a crankshaft to the'chuck in a rigidly held manner and in a position with thesaid bearing in position for engagement by the said means within thechuck.

16. In a lathe, a center drive chuck, means for inserting a shaft intothe chuck to a delinite axial 'position and means Within the .chuck forcentering av crank shaft axially and circumferentially.

17. In a lathe, a center drive chuck, means for inserting a shaft intothe chuck to a definite axial position and means within the chuck forautomatically centering a crank shaft axially and circumferentially.

18. In a center drive chuck lathe, means movable in an axial directionwith relation to the chuck while held rigidly against other movement,and then downward to deposit a crank shaft in the chuck, said meanshaving a member to hold the shaft, and means in the chuck to engagetwocheeks of the crank, and having an equalizing movement whereby theshaft is centered circumferentially when deposited in the chuck.

WILLIAM F. GROENE.

